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Publication detail

Swelling of acrylic microgels in aliphatic ketones
Year: 2008
Type of publication: článek v odborném periodiku
Name of source: Progress in Organic Coatings
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: 71-78
Titles:
Language Name Abstract Keywords
cze Rozustnost akrylátových mikrogelů v alifatických ketonech Článek prezentuje výsledky v oblasti rozpustnosti ?OH funkcionalizovaných mikrogelů a alifatických ketonech. Mikrogely byly syntetizovány semikontinuální emulzní polymerací, MMA, BMA, HEMA, AMA. Byl zjištěna závislost rozpustnosti v závislosti na stupni zesítění mikrogelů. Dále byly mikrogely využity jako prekurzory sítí pro komerční akrylátové systémy. Bylo zjištěno, že mikrogely rozpuštěné v acetonu, nemají negativní vliv na vzhled ilmu, naopak zlepšují finální vlastnosti filmu a dobu vytvrzování. Emulzní polymerace; rozpustnost mikrogelů; akrylátové sítě; prekurzory sítí
eng Swelling of acrylic microgels in aliphatic ketones The paper deals with the swelling behaviour of hydroxyl-functionalised microgels in the presence of aliphatic ketones. The copolymer microgels with different cross-linking densities were synthesized by the semi-batch emulsion copolymerisation of methyl methacrylate, butyl methacrylate, 2-hydroxyethyl methacrylate and allyl methacrylate. The extent of microgel particles swelling was evaluated using the dynamic light scattering, the potentiometric titration of accessible hydroxyl groups and the solvent-uptake measurements. It was found that the swelling ability of microgels decreased with growing degree of cross-linking. Microgels comprising copolymerised butyl methacrylate swelled less in utilised aliphatic ketones than microgels without this comonomer. Among all the investigated solvents, acetone was found to be the strongest solvent, while 5-methyl-2-hexanone (methyl isopentyl ketone) was shown to be the weakest one. Further, the microgels were investigated as reactive network precursors in a commercial thermosetting solvent-borne acrylic binder. It was shown that the application of functionalised microgels that were redispersed in acetone did not affect the surface appearance and transparency of coatings. Moreover, the presence of microgel network precursors accelerated film curing at ambient temperature and improved final hardness of coatings. Emulsion polymerisation; microgel swelling; acrylic lattices; network precursors

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